Sea shell collection

I bought this collection of sea shells today for ten bucks. Im guessing at one point they were somebodys personal collection because of how they were bagged seperately and they do not look like what you would get if you just bought a bag of random shells. Anybody know anything about them? ive tried to do some research but haven't really gained much insight.

Also, check Ebay 'sold' for shells and identify which ones you have. I bought one box a while back from a huge collection from a late marine biologist, all superb examples with labels. One went for 129.-a Brazillian conch.